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The mkiv Supra Owners Club

Q trim VS P trim


SupraHuman

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What is the difference between the two trims when it comes to the turbo?

Is it the shape of the housing,the size of the impeller etc?

 

I am about to get my new tubby from Comp Turbo ordered and there are just WAY to many options there,don't want to get it wrong.

 

Thanks in advance

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Im pretty sure its to with turbine and housing design. With the housing its just to do with the angle of the outlet to the intercooler piping.. i.e Q trim angles out so you can fit intercooler piping like stock (through the inner wing) P trim angles straight down for a short run to the intercooler but usualy have to modify the waterneck to suit the fitment..

'waits to be corrected' :innocent:

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Something not quite right in that explanation as turbine housing design & outlet to intercooler contradict each other, ones hot side, others cold side.

 

From a Precision document they describe the 2 as:

 

P = P Trim, Quick spool with sacrafice of some top end boost

Q = Q Trim, Normal spool with more top end boost

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well i tried :D im sure somewhere i read there was a difference in turbine wheel (hot side) aswel as the housing :shrug:

:D

 

With the compressor covers, these are Precisions definitions:

 

B = B Cover Compressor Housing 2.625" inlet, 1.75" outlet

E = E Cover Compressor Housing 3" inlet 2" outlet

H = H Cover Compressor Housing 4" inlet 3" outlet

HB = H Cover Compressor Housing 4" inlet 3" outlet with a bellmouth

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